Humus is classified according to how well it is incorporated into the mineral soil, the types of organisms involved in its decomposition, and the vegetation from which it is derived.
根据腐殖质与矿物质土壤的结合程度、分解作用中所含的有机物类型以及原有的植被，腐殖质可区分为几个类型。
The mineral elements from the soil that are usable by the plant must be dissolved in the soil solution before they can be taken into the root.
土壤中对植物有用的矿物质元素必须先溶解在土壤溶液中，然后才能被根吸收。
In modern agriculture, mineral depletion of soils is a major concern, since harvesting crops interrupts the recycling of nutrients back to the soil.
在现代农业中，土壤的矿物损耗是一个主要的问题，因为收割农作物会中断养分的循环，使其无法重新回到土壤中。
The United States is a land rich in mineral resources and fertile farm soil, together with a moderate climate.
美国具有丰富的矿产资源和肥沃的农田，气候温和适中。
The team is investigating elements in the mineral calcium carbonate, which were deposited in the mud and soil in and around a lake between two and 1.7 million years ago.
该小组正在调查碳酸钙矿物中的元素，这些碳酸钙矿物沉积于距今2至170万年的湖内部及周边的淤泥和土壤中。
Mineral stability can depend upon the amount by which the soil is oxygenated.
矿物的稳定度可由土壤中氧化的程度所决定。
In other parts of the continent, people are questioning why they aren't getting more for the mineral riches that lie in abundance beneath Africa's soil.
在非洲大陆的其他地方，人们都在质疑，为什么他们没有从位于土壤之下的丰富矿产得到更多的财富。
Abstract: phosphorus is one of the essential mineral elements to plant growth, however, there is fairly less content of soluble phosphorus in soil.
摘要：磷元素植物生长必需的矿质元素之一，而土壤中可溶性磷的含量比较低。
Mineral analysis of soil samples in the laboratory, the island's volcanic soil at least contain a so-called saprolite weathered rock.
在实验室对土壤样品进行矿物质分析，发现岛上的火山土壤至少含有一种称之为腐岩的风化岩石。
Brazil nuts. Thanks to the rich soil in which they grow, Brazil nuts are loaded with selenium, a trace mineral that some research has linked to upbeat moods.
巴西坚果。由于种植巴西坚果的土壤肥沃，巴西坚果富含硒，这是一种微量元素，某些研究表明它与提高情绪有关联。
It results from cosmic rays reaching the earth from the outer space, and from the radioactive decay of mineral in the soil.
它来自星际空间抵达地球的宇宙射线，来自土壤中矿物质的放射性衰变。
The soil nutrients, the contents and seasonal dynamics of mineral elements as well as the relationship among the elements in leaves of fruit-bearing trees of Citrus grandis Osbeck cv.
研究了梅州沙田柚两个果园的土壤养分、结果树营养叶片不同生育时期的矿质元素含量及季节性动态变化情况和各元素的相互关系。
The time of dynamic nitrogen adjustment were determined by regular patterns or by the comprehensive evaluation of soil mineral nitrogen concentration and rice population status.
氮素动态调控时期由高产栽培常用的追肥时期或根据水稻群体状况与土壤矿质态氮浓度综合判断确定，追氮量由模型计算获得。
Many indexes can be used to reflect character of expanded soil. They are divided into mineral composition and engineering behavior.
反映膨胀土土质与土体特性的指标很多，可分为反映矿物组成和工程特性的指标两大类。
Phosphorus is one of the essential mineral elements to plant growth, however, there is fairly less content of soluble phosphorus in soil.
磷是植物生长必需的矿质元素之一，而土壤中可溶性磷的含量比较低。
Combined with the fitting parameters obtained from the VG model, the effects of mineral composition and pore structure of the soil on SWCC are analyzed.
结合VG模型拟合的参数，着重分析了矿物成分和孔隙结构对膨胀土土水特征曲线的影响。
The content of mineral element is correlated with soil textural composition.
矿质元素含量与土壤质地密切相关。
The physical properties, mineral composition and expansive-shrinkage characteristics of the borrow soil were studied, and the evaluation of expansive potential was carried out.
研究了路基土场土的物理性能、矿物组成及胀缩特性，采用多种方法综合评价土场土膨胀潜势；
The increased content of the soil mineral nutrients could reduce chalkiness rate of rice.
不同土壤的矿质养分含量增加可降低稻米垩白；
Natural resources as mineral water, clay, swell soil, peaty soil and building sand are also quite rich in amount.
矿泉水、粘土、膨润土、泥炭土、建筑用砂等资源也都十分丰富。
The mineral nitrogen in soil was greatly changed no matter whether wheat was planted or not.
种与不种作物，土壤矿质氮都处在不断变化之中。
The management of the straw returning to the fields was closely related to the dynamics of mineral nitrogen in the soil.
土壤中矿质态氮动态变化是秸秆还田管理决策的重要依据。
Adsorption capacity of mineral is stronger than that of soil.
矿物的吸附能力比土壤强。
The ebony is really specific groundwater, soil and other natural conditions and to adapt to the mineral content in order to form.
真正的乌木实在特定的地下水，土等自然条件下和适应的矿物质含量中，才能形成。
The results show that different soil types or subtypes of soil have markedly different mineral compositions, and that the number and contents of mineral species vary greatly.
不同土类或亚类土壤中矿物组成存在明显差异，矿物种数和含量变化较大。
The critical content of mineral oils in soil was presented for second-year-old Reed canary grass.
提出了第二年生草土壤的矿物油临界含量。
With the improvement of the content of soil moisture, the mineral nutrition uptake amount improves notably.
随着土壤水分含量的提高，植株对矿质元素的吸收量显著提高。
The influence factors of CBR of expressway subgrade materials are studied, such as the soil particle sizes and mineral components.
根据土样塑性指数相同，而CBR值差异很大的实验结果，从土体的颗粒组成、矿物成分等几方面研究了其对填料CBR值的影响。
The results showed that the degradation rate of mineral oil was promoted by fertilization in alfalfa soil, but not in paddy rice soil.
结果表明，投肥对苜蓿草土壤中矿物油降解有促进作用，但对水稻土壤中矿物油降解无明显作用。
The results showed that the degradation rate of mineral oil was promoted by fertilization in alfalfa soil, but not in paddy rice soil.
结果表明，投肥对苜蓿草土壤中矿物油降解有促进作用，但对水稻土壤中矿物油降解无明显作用。
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